This is a Unique Navajo Bear Paw Shape Blue Gem Turquoise Ring Size 7.5 Sterling Silver Vintage. The Blue Gem Mine is no longer active and closed in the 1970's. The sterling silver patina/tarnish has been left on to preserve the value. It is not marked but tests positive for sterling silver. The cold chisel split shank has a curved band for easy comfortable fit. The Blue Gem turquoise stone is strong in color with matrix. The face measures 1-1/4 inches long and 3/4 inches wide. It weighs 10.1 grams.